I just got my HP2755 in and I'm very pleased with it so far. One of the nice features it has is finger-print ID for access, so patient info is secure I would think.
This unit has 256Meg of memory and runs at 624MHz, built-in wifi, bluetooth, and it is also small and compact. It runs in portrait or landscape mode, has a voice recorder, and multiple expansion slots.
Of course, being a iPAQ, a Pocket PC, it plays nice with outlook, the battery can be changed by the user, and it can run multiple programs at once, unlike the Palm units. Check it out.